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Table 3 Groups of S. suis strains with different combinations of tetracycline genes and respective minimal inhibitory concentrations.

From: The antimicrobial resistance patterns and associated determinants in Streptococcus suisisolated from humans in southern Vietnam, 1997-2008

Number of isolates Group Tetracycline resistance genes MIC50* (mg/L) Range of MIC (mg/L) p-values#
5 1 tet(M), tet(O) and tet(L) or tet(M) and tet(L) 64 64 - 256 0.01 (group 1 vs. 2)
      <0.001 (group 1 vs. 3)
      0.002 (group 1 vs. 4)
      0.002 (group 2 vs. 3)
      0.03 (group 2 vs. 4)
      0.08 (group 3 vs. 4)
8 2 tet(M) and tet(O) 32 24 - 48  
116 3 tet(M) 24 3 - 48  
22 4 tet(O) 24 16 - 32  
  1. * MIC50 is the MIC value inhibiting growth of 50% of tested isolates
  2. #Pair-wise comparisons based on Wilcoxon rank-sum tests with Holm correction for multiple testing